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Netlab Reference Manual hesschek
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<H1> hesschek
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Purpose
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Use central differences to confirm correct evaluation of Hessian matrix.

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Synopsis
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<PRE>
hesschek(net, x, t)
h = hesschek(net, x, t)</PRE>


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Description
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<p><CODE>hesschek(net, x, t)</CODE> takes a network data structure <CODE>net</CODE>, together
with input and target data matrices <CODE>x</CODE> and <CODE>t</CODE>, and compares
the evaluation of the Hessian matrix using the function <CODE>nethess</CODE>
and using central differences with the function <CODE>neterr</CODE>.

<p>The optional return value <CODE>h</CODE> is the Hessian computed using
<CODE>nethess</CODE>.

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See Also
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<CODE><a href="nethess.htm">nethess</a></CODE>, <CODE><a href="neterr.htm">neterr</a></CODE><hr>
<b>Pages:</b>
<a href="index.htm">Index</a>
<hr>
<p>Copyright (c) Ian T Nabney (1996-9)


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